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Term	Definition
Impressed	Sunk below the surface as if pressed in; e.g., some leaf veins in relation to the rest of the leaf surface. Compare with immersed.
Impressed	Sunken below the surface as if pressed in; e.g., some leaf or seed veins in relation to the rest of the leaf or seed surfaces.
Included	Not protruding from a structure, such as the stamens from the corolla. Opposite of exserted.
Incross	In flowering plants, the production of viable seed by the movement of pollen from one flower to another flower of the same plant..
Indehiscent	Not opening; usually applied to fruits that remain closed at maturity. Opposite of dehiscent.
Indehiscent fruit	Referring to a fruit that does not open via an operculum.
Indeterminate	Referring to an inflorescences whose main axis continues to grow; i.e., is not terminated by a flower (e.g., a raceme); referring to the compound leaf of Guarea (Meliaceae) in which the tip of the rachis has the potential to continue growing.
Indeterminate inflorescence	Referring to an inflorescences whose main axis continues to grow; i.e., is not terminated by a flower (e.g., a raceme or spike); also referring to the compound leaf of Guarea (Meliaceae) in which the tip of the rachis has the potential to continue growing
Index Herbariorum	a href="https://sweetgum.nybg.org/science/ih/"Index Herbariorum/a (the abbreviation is IH) provides codes (called acronyms) for the herbaria of the world with more than 5,000 specimens. In addition, it gives the essential information about the number of specimens, important collections, a list of staff, and a summary of the specialties of the herbaria and their staff. The IH is published electronically which enables updating the information periodically and allows for the data to be retrieved through searches. For example, assume that a user wanted to find out if there were specialists in Sapotaceae, he or she could type the family name into the specialty box and Sapotaceae specialists in all registered herbaria will be listed. The current manager of IH is Dr. Barbara Thiers, the Director Emerita of the Herbarium of The New York Botanical Garden. Please contact bthiers@nybg.org for all IH inquiries.
Indusium (plural = indusia)	Usually referring to the protective covering of the sporangia of some ferns, but sometimes used to refer to other structures; e.g., the stylar outgrowth of species of Goodeniaceae.
Indusium false (plural = indusia false)	Referring to an indusium formed by the enrolled leaf margins of a fern.
Inferior ovary	An ovary in which the floral parts (calyx, corolla, and stamens) arise from the summit; e.g., in Rubiaceae and Asteraceae.
Inflorescence	The structure in which the flower or flowers are displayed on a plant.
Inflorescence	The structure in which the flower or flowers are displayed on a plant.
Infra adjacent secondary vein	Referring to the relationship of two secondary veins, in this case referring to a secondary vein that is below another (i.e., in a basal or proximal position in relationship to the other).
Infracalycine zone	The area between the calycine ring and the pedicel scar in a fruit of Lecythidaceae.
Infracalycine zone rounded	The infracalycine zone is rounded from the calycine ring to the pedicel scar thereby giving the fruit a cup-like shape.
Infracalycine zone tapered	The infracalycine zone tapers from the calycine ring to the hypanthium/pedicel
Infracalycine zone truncate	An ovary or a fruit which abruptly turns inward from the calycine rim to the pedicel/hypanthium. Same as truncate fruit.
Infrafoliar inflorescence	An inflorescence that arises from the branches (ramiflorous) or trunk (cauline) below the leaves.
Infraspecific variation	Morphological and anatomical variation with a species.
Infructescence	The structure in which fruits are displayed on a plant.
Infundibular	Usually referring to a corolla in the shape of a funnel but can also be applied to other structures with a similar shape.See funnelform.
Inner bark	The functional phloem that occupies the region between the most recent periderm and the vascular cambium.
Inner bark	All tissure surrounding the trunk and stems from the vascular cambium inward, i.e., the living bark tissue.
Inner integument extruded	An inner integument that is longer than the outer integument and forms the micropyle.
Inserted	Joined to or placed on; e.g., the stamens inserted on the corolla of Rubiaceae; also refers to stamens that do not extend beyond the corolla, in that case opposite of exserted.
Integument	The outer covering of the ovule that develops into the testa or seed coat; it may be composed of one or two layers, the inner and outer integuments, respectively.
Integument	The outer covering of the ovule that develops into the testa or seed coat; it may be composed of one or two layers, the inner and outer integuments, respectively.
Interfoliar	Borne among the leaves; e.g., the inflorescence of Attalea (Arecaceae).
International Code of Botanical Nomenclature (ICBN)	A set of rules governing the naming of plants. Every five years, the rules are reviewed at the International Botanical Congress and a new set of rules, many of which are the same, is published.
Internode	The part of the stem between nodes.
Interpetiolar	Located between the petioles of two opposite leaves; e.g., the stipules of Rubiaceae.
Intersecondary vein	A leaf vein that is intermediate in size between secondary and tertiary veins and often runs parallel to the secondary veins that it runs between. At about the middle between the midrib and the leaf blade margin intersecondary veins start to ramify dendritically.
Intersecondary vein	A leaf vein that is intermediate in size between secondary and tertiary veins and often runs parallel to the infra adjacent and supra adjacent secondary veins bounding it. At about the middle between the midrib and the leaf blade margin, intersecondary veins start to ramify dendritically.
Interseminal sinuses	The invaginations between the seeds in a legume pod.
Interspecific variation	Variation among populations of different species.
Intramarginal vein	A vein close to and parallel to the margin of a leaf.
Intrastaminal	Placed inside of the stamens; e.g., the discs of most Anacardiaceae and Meliaceae.
Intrastaminal disc	A fleshy, lobed, or annular nectariferous structure found within flowers between the stamens and the pistil. Preferred spelling is disc. Not to be confused with disk flower.
Invasive	A species of plant, animal, or microbe from one area that is introduced into an area where it was not present before and once established in the new habitat it causes economic damage, outcompetes native species thereby causing them to become less common, causes native species to be extirpated from some areas, or drives native species to extinction.
Involucre (diminutive = involucel)	A series of fused, overlapping, or free bracts that subtend inflorescences (e.g., in some Apiaceae, many Asteraceae, and Euphorbia of the Euphorbiaceae) or flowers (e.g., the female flowers of species of hickory (Carya spp.).
Irregular flower	A flower capable of being divided into only two equal parts (mirror images) by a line passing through the middle of a flower, i.e., other lines passing the middle of the flower will not give mirror images of one another; same as zygomorphic, monosymmetric, and bilaterally symmetrical, flowers and opposite of actinomorphic, monosymmetric, radially symmetrical, and regular flowers. This term can refer to other plant parts as well.
Isocotylar cotyledons	Cotyledons that are morphological identical
Isocotylous	Referring to seedlings in which both cotyledons are similar in shape and size. Compare with anisocotylous.
Isodromous	Referring to a venation pattern in which the first two veins in a given leaf segment arise opposite one another. Compare with anadromous and catadromous.
Isotype	A duplicate of the holotype. If a collection selected as the holotype has duplicates, the duplicates are called isotypes.
Iteropary (iteroparic or iteroparous)	Referring to plants that flower repeatedly; i.e., those that do not die after a single flowering. Same as polycarpic and pleionanthic; opposite of hapaxanthic and monocarpic.
Keel	Ridged like the bottom of a boat; same as carinate.The two lower, united petals of the flower of most species of Fabaceae subfamily Papilionoideae.
Keeled	Bearing a keel, same as carinate.

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